Insulating composition.



is light, tough, "thoroughly mo1sture-proof armies.

. conrbnnr'iou, a conroimrio'u OF NEW YORK.

, insutnriue comrosrrion.

No Drawing.

To all whom it may concern;

-' Be it known that IyWALTER FREEMAN,

:a citizen ofthe United vStates, residing at Oscawana, in the county ofWestchester' exact description of the invention, such as will enableothers skilled in the artto make anduse the same.

My invention relates to insulating. compounds and articles -madetherefrom, and the object of my invention is to produce an' article ofhiglfi insulating properties which and unaffected by atmosphericconditions,

and tOJthisend, 'I utilize as an ingredient, of

Number 803,043 filed on even date 'heremy insulating compound'flalarge'percentage of the wood derivatives; recovered from the sulfitewaste liquor of wood pulp mills. In my co-pending application, Serialwith, I have described a method of recovering from the sulfite'wasteliquor of ,wood

pulp mills, by adding to condensed sulfite liquor first, a solublechlorid, such as hydro- 1 chloric acid, and then analkali, ammonia, thewood derivatives'and alsothe sulfurous acid and. calcium constituentsinthe form of substantially neutral inert substances, and I have used theword Fxylium to designate broadly the substantially neutralized inertrecovered product whether-in a syrupy or dry state. Another suggestionin the same case, is the use firstof sodium chlorid and. then of bariumchlorid. To the'products of the latter treatment, the same term isapplicable. It was'pointed' out in that application that if the woodderivatives'were .to be recovered and separated from the sulfurous acidand calcium constituents of the liquor, the liquor was concentrated,

treated with a chloridic'agent, such as hydrochloric acid or sodiumchlorid, and then treated with a suitable precipitant agent as ammoniaor barium chlorid in limited quantity to effect precipitation of thesulfurv and calcium compounds of the liquor, after Whichthe syrupy masscontaining'the wood derivatives oi the liquor was drawn off from theprecipitate and then bleached if desired, and evaporated down to a drymass and ground into powder. I termed this recovered substancecontaining the Wood siiecification cf Letters Patent.

Application filed November 25, 1913. Serial No. 803,046.

derivatives separated from theiprecipitates,

whether in the syrupy or powdered state, xylozo. It was. also pointedout that if to remain 'unsep'arated in the neutralized mixture, themixture could be treated so as WALTER K. FREEMAN; or oscAwAim, new YORK,ASSIYGNTOR 'ro HYDRoLosE-rnocnss the wood derivatives andneutralizedsulfurous acid and calcium ingredlents were to effectprecipitation of the sulfur calcium compounds, or it could be treated insuch a way as to simply convert such compounds into inert substancessuspended through-the mass, as may be desired and I termed thisresulting mixture, whether in the syrupy or anhydrous state, xylosca.

In this specification, I will use the terms xylium, xylosca? and xylozoin the .sense stated, to designate the neutralized products recoveredfrom the sulfite waste liquor.

In order that those skilled in the art may thoroughly understand myinvention and the method of practising the same, I will describein'detail what I believe to be the best method of carrying out myinvention.

I mix and grind together disintegrated dry xylium a small percentage ofdisintegrated dry resin'or suitable gum, such as gum copal, a suitableamount of a'pUWF dered metallic oxid and chlorid, and preferably asuitable amount of disintegrated hard refractory material, such asground glass, mica, crushed marble or other material ofvhigh insulatingproperties. These ingredients are thoroughly intermixed and reducedtopowdered form, as by, grinding them together, and to the resultingpowder is added water in quantity just enough to cause the occurrence ofthe chemical action powder having a suitable percentage of moisture isthen packed in asuitablemold and subjected to heavy pressure toconsolidate it and to hasten the chemical action...

necessary to convert the oxid with the The articlesbeing thus formed aretaken from the molds and indurated by first dipping them. in a solutionofbarium chlorid and-then into a solution of aluminum sul fate anddried, after which they are dipped in a weak'solution of sulfuric acidand again dried. The articles may then be polished byltumbling them withsawdust. In this manner any suitable form of electrical insulators suchas rosettes, cleats, switch slabs, or ornaments, or other usefularticles may be made, or if desired, the moistened powder may be forcedthrough dies under pressure to form rods or tubes, which may beindurated as above described.

I have found in practice that the following proportion of the differentingredients form a composition from which highly satisfactory insulatingarticles may be.made: approximately 30 parts by weight of dry xylium,approximately parts by weightv of dry magnesium oxid, approximately 10parts by weight of dry magnesium chlorid,

approximately 5 parts by weight of resin or other suitable hard gum, andpreferably from 20 -to 200 parts of a suitable material of highelectrical resistance, such as powdered glass.

It will be obvious to those skilled in the art, after this disclosure ofmy invention, that various changes and substitutions may be made in themethod of mixing the different ingredients and in the proportions andmgredients used. For mstance,'1t is immaterial to my invention Whetherthe,

metal chlorid be added in thedry form and ground up with the otheringredients, or whether the other ingredients are first ground togetherand the chlorid added in the form of a very concentrated solution andused to moisten the powdered mixture of the other ingredients, so longas sufficient chlorid is present in the solution to effect, with theoxid, the bonding action; and, if

desired, any suitable metal oxy-chlorid, such factory results, sincesuch an oil will harden under the oxy-chlorid bond. and avoids anystickiness in the composition, also, instead of indurating the articles,they may be vulcanized byproper treatment with sulfur and heat, ifdesired.

Having thus described .my invention, what I claim as new and desire tosecure by Letters Patent, is:

1. A new composition of matter for insulating purposes comprisingsulfite cellulose liquor, concentrated, treated with a chloridicreagent, and ,then with an agent adapted to precipitate sulfur andcalcium compounds from the liquor, dried with the precipitate thereinand ground, an oxid and chlorid capable of reacting to make anoxy-chlorid binding agent, and a small percentage of gum.

2. A new composition of matter for insu lating purposes comprisingsulfite cellulose liquor, concentrated, treatedwith a chloridic reagent,and ,then with an agent adapted to precipitate sulfur and calciumcompounds from the liquor, dried with the precipitate therein andground, an oxid and chlorid capable of reacting to make an oxy-chloridbinding agent, a powdered refractory material, and a small percentage ofgum.

3. A new composition of matter for insulating purposes comprisingsulfitc cellulose liquor, concentrated, treatediwith a chloridicreagent, and then with an agent adapted to precipitate sulfur andcalcium compounds from the liquor, dried with the precipitate thereinand ground, an oxid and chlorid capable of reacting to make anoxy-chlorid binding agent, a suitable inert matter of high insulatingproperties, and a percentage of gum.

Intestimony whereof I affix my in the presence of two subscribing l I. I

